diff --git a/nemu/src/isa/riscv32/inst.c b/nemu/src/isa/riscv32/inst.c
index ad9d52a..2574e54 100644
--- a/nemu/src/isa/riscv32/inst.c
+++ b/nemu/src/isa/riscv32/inst.c
@@ -128,7 +128,6 @@ static int decode_exec(Decode *s) {
   INSTPAT("0000000 ????? ????? 111 ????? 01100 11", and    , R, R(rd) = src1 & src2);
 
   INSTPAT("0000000 00001 00000 000 00000 11100 11", ebreak , N, NEMUTRAP(s->pc, R(10))); // R(10) is $a0
-  INSTPAT("??????? ????? ????? ??? ????? ????? ??", inv    , N, INV(s->pc));
 
   // "M"
   INSTPAT("0000001 ????? ????? 000 ????? 01100 11", mul    , R, R(rd) = src1 * src2);
@@ -140,6 +139,7 @@ static int decode_exec(Decode *s) {
   INSTPAT("0000001 ????? ????? 110 ????? 01100 11", rem    , R, R(rd) = (sword_t)src1 % (sword_t)src2);
   INSTPAT("0000001 ????? ????? 111 ????? 01100 11", remu   , R, R(rd) = src1 % src2);
 
+  INSTPAT("??????? ????? ????? ??? ????? ????? ??", inv    , N, INV(s->pc));
   INSTPAT_END();
 
   R(0) = 0; // reset $zero to 0